forked from docs/doc-exports
Qin Ying, Fan
139ab2d266
Reviewed-by: Hasko, Vladimir <vladimir.hasko@t-systems.com> Co-authored-by: Qin Ying, Fan <fanqinying@huawei.com> Co-committed-by: Qin Ying, Fan <fanqinying@huawei.com>
14 lines
1.7 KiB
HTML
14 lines
1.7 KiB
HTML
<a name="nat_faq_0002"></a><a name="nat_faq_0002"></a>
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<h1 class="topictitle1">What Are SNAT Connections?</h1>
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<div id="body1531445624883"><p id="nat_faq_0002__p8060118">An SNAT connection consists of the source IP address, source port, destination IP address, destination port, and a transport layer protocol. These five elements identify a connection as a unique session. The source IP address refers to the EIP, and the source port refers to the EIP port. They will be used to access the destination IP address and port of the Internet.</p>
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<p id="nat_faq_0002__p20617117185216">SNAT supports three protocols: TCP, UDP, and ICMP. A NAT gateway supports up to 55,000 concurrent connections for each destination IP address and port. If any of the destination IP address, port number, and protocol (TCP/UDP/ICMP) changes, you can create another 55,000 connections. The number of connections you query on an <span id="nat_faq_0002__text20171168152416">ECS</span> may be different from the actual number of SNAT connections. (You can run the <strong id="nat_faq_0002__b1651883184717">netstat</strong> command to query the number of connections.) Assume that an <span id="nat_faq_0002__text14312205279">ECS</span> creates 100 connections to a fixed destination every second. 55,000 connections will be used up in about 10 minutes without considering the dropped idle connections. As a result, new connections cannot be established.</p>
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<p id="nat_faq_0002__p691421205812">If there is no data packet passing through the SNAT connection for a long time, the connection will be timed out. </p>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="nat_faq_0200.html">SNAT</a></div>
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</div>
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</div>
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